Bio:Inhabitant of Central City in the 25th century who had spent a lifetime studying the Flash and the Speed Force. When a time-capsule containing one of the Flash's costumes materialised near him, Thawne was able to extract the Speed Force energy it contained and utilise it to give himself super-speed. He travelled to the twentieth century on numerous occasions but was always defeated by the Flash and sent back to his own era.

Zoom was in love with Iris Allen (even attempting to take Barry's place on their wedding day) and made several attempts to steal her away. Ultimately he realised that he could not have her, and murdered her by scrambling the molecules of her brain with super-speed vibrations. When the Flash discovered he was responsible, he abandoned Zoom in a malfunctioning time machine heading back to the origin of the Universe. Zoom managed to escape and crashed Barry's second wedding, trying to murder his bride Fiona Webb in the same way. The Flash was forced to break Zoom's neck to stop him, which led to him being charged with the villain's murder.